C D E F G Contains sarcomeres linked together by z-discs. Represents where the neuron chemically communicates with the muscle cell, exciting the cell so contraction can occur. run deep into the muscle cell allowing the electrical signal to excite all myofibrils. Perpendicular to the sarcoplasmic reticulum. Series of membrane tubes that wrap around every myofibril. Contains calcium ions that will be released once excited by the t-tubules Action Potential. plasma membrane of the muscle cell connective tissue covering of muscle cell. Extends to form tendons. sends electrical signals to the muscle cell B (transverse tubules) D (sarcoplasmic reticulum - SR) E (Sarcolemma) A (Myofibril) F (axon of the somatic motor neuron) C (NMJ) G (endomysium)
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